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pkg/httpx/basic.go

@@ -0,0 +1,24 @@
+package httpx
+
+import "net/http"
+
+var basicUnauthorized = []byte("Unauthorized")
+
+// BasicAuth returns a new [http.Handler] that requires any credentials to pass the check function
+func BasicAuth(handler http.Handler, realm string, check func(username, password string) bool) http.Handler {
+	var authenticateHeader = `Basic realm="` + realm + `"`
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// if the basic authentication passes
+		// we can just use the handler!
+		user, pass, ok := r.BasicAuth()
+		if ok && check(user, pass) {
+			handler.ServeHTTP(w, r)
+			return
+		}
+
+		// http authentication did not pass
+		w.Header().Add("WWW-Authenticate", authenticateHeader)
+		w.WriteHeader(http.StatusUnauthorized)
+		w.Write(basicUnauthorized)
+	})
+}